Pc turned off and turn on.how can i fix it?

i have a problem with my pc.iit’s keep turning on and then turning off and keeps with the same problem and before it was ok.the screen turned on with with windows 10 loading in the background.what possibly could be the problem?.i added an attachment file.video file that shows the problem with it.

I would recommend reaching out an or posting in a support group for your Windows PC.